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Most of a tree's mass is derived from water and carbon dioxide. There is also some contribution from minerals.
Gazza, The processes in plants take the hydrogen and oxygen in water and the carbon and oxygen in carbon dioxide and rearrange them to make hydrocarbons. In a tree this is mainly cellulose. These hydrocarbons are why plant materials from millions of yrs ago have decayed and formed oil etc, which is what most people think of when they hear the word hydrocarbon.PS when a tree falls, it is gravity that pulls it down 
(Technically hydrocarbons only have C and H)